By David J. Eicher
The central peak in the lunar crater Tycho, from LRO data; the tiny boulder nested on the central peak is the size of a football stadium, U.S. Geological Survey, Astrogeology branch, Flagstaff, Arizona, Feb. 9, 2015.
Related blog: A visit to the U.S. Geological Survey's Astrogeology branch in Flagstaff